pc network via phone system

Can anyone tell me how the USA phone sockets are wired to support networking
PCs via the telephone wiring

TIA
Dave

On Wed, 17 Nov 2004 18:48:40 -0000, "David Jones"
<(E-Mail Removed)> wrote:

>Can anyone tell me how the USA phone sockets are wired to support networking
>PCs via the telephone wiring

they put another signal on top of the voice signal, look up HomePNA
with google or see http://www.homepna.org/

middle two pins used for a 1 line phone jsut the same. BT were selling
something similar here (as part of a bundle)
http://www.adslguide.org.uk/hardware...q2/bt-1200.asp

Phil
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Many thanks for that Phil - it was an actual diagram of the socket wiring
connections I was after but can't find one anywhere. I remember someone
posting details of the connections on this group not long ago but it has
since gone as expired mail
Thanks again
Dave

On Wed, 17 Nov 2004 21:39:52 -0000, "David Jones"
<(E-Mail Removed)> wrote:

> it was an actual diagram of the socket wiring
>connections I was after but can't find one anywhere. I remember someone
>posting details of the connections on this group not long ago but it has
>since gone as expired mail

groups.google.com any use - esp if you can remember name of thread.

I'm not 100% clear what you mean by "diagram of the socket wiring" -
what are you trying to do ? I've used them in hotels and the "modem"
or adaptor just plugs into the phone on one side and ethernet on the
other to the PC, though I've seen USB versions too. The phone wiring
is not affected.

Phil
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Apparently networking via the phone wiring system is common in the USA -
this is what I have done and my 2 PCs are working fine but when a phone call
comes in or goes out the broadband connection drops. All my sockets are
filtered and the filters have been checked cross checked and replaced with
high quality filters (I think it was you that recommended this Phil) but I
am still having the problem . When I requested advice from the group (about
August)
someone posted and said it works fine in the USA because the phone sockets
there are wired differently to ours and went on to explain exactly how. That
message has since expired and I wanted to refer to it to see if perhaps it
was another avenue I could try

Dave

On Wed, 17 Nov 2004 22:42:14 -0000, "David Jones"
<(E-Mail Removed)> wrote:

> When I requested advice from the group (about
>August)
>someone posted and said it works fine in the USA because the phone sockets
>there are wired differently to ours and went on to explain exactly how.

they only use two wires, the centre two pins, there is no 3rd wire for
bell ringing. Don't see how that could make the difference though.

I'm not clear if you are using the HomePNA type equipment for
networking over the phnoe wires or if you are just using other cores
in the phone cable for the networking?

If you disconnect the networking does it still drop out when a call
comes in or goes out - ie is the broadband issue separate from that of
networking.

Do you have microfilters in sockets that don't have anything plugged
in ? (not sure it matters).

Phil
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Come on down !

On Thu, 18 Nov 2004 09:36:48 +0000, Phil Thompson
<(E-Mail Removed)> wrote:

>they only use two wires, the centre two pins, there is no 3rd wire for
>bell ringing. Don't see how that could make the difference though.

hunting back to the previous debates there was reference to US houses
with two lines in where the socket has both lines ie pins 2 and 5 are
Line 2 and pins 3 and 4 are Line 1 (6 pins total).

There is scope for "issues" if you use a US kit in the UK where the
ring signal appears on pin 3 however the networking kit needs to be on
the ADSL side of a microfilter and most of these only present pins 3&4
on the RJ11 socket which should fix it.

I see you are using some kind of HomePNA type equipment however you
say the problem remains if the netowrk is not being used. Does it
persist if the network adaptors are all physically unplugged ? If so
you have a simple "my broadband drops when I pick the phone up" issue
which is nothing to do with home networking at all (and may get better
answers in uk.telecom or uk.telecom.broadband)

Phil
--
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Come on down !

Phil,

The PCI card in each machine has a cable from the card that terminates in a
standard BT plug that goes into the standard BT wall socket. I have just
had another fiddle to check my assumptions and am satisfied that the problem
occurs only when #2 PC is connected to the phone system via the wall socket.
It makes no difference whether or not #2 PC is switched on. So the simple
act of plugging the cable into the wall socket - or conversely removing the
plug from the socket - also causes the broadband connection to drop.

So, whenever both PCs are connected to their respective BT phone sockets the
problem occurs - irrespective of whether or not #2 PC is switched on. I
have tried moving #2 PC from one room to another and connecting it via the
BT Master socket but the problem still occurs. I tried this because the
extensions were fitted by the the builder when the house was built and you
never know if they were fitted by someone who knew what they were doing or
by the site electrician's apprentice! Disconnect #2 PC's connection to the
phone socket and the main PC works perfectly 100% of the time.

I have tried disconnecting and plugging back in the various telephone
handsets in the house and that causes no disturbance at all - the broadband
connection stays up. I don't have the courage to open up phone sockets but
I do have a friend who used to be a BT engineer so it's time to get in touch
with him I think.

Thanks for your thoughts - they are appreciated as they give me other
aspects on the situation.

Dave

On Thu, 18 Nov 2004 11:16:23 -0000, "David Jones"
<(E-Mail Removed)> wrote:

> Disconnect #2 PC's connection to the
>phone socket and the main PC works perfectly 100% of the time.

interesting, I assume even when you make a call.

Any chance this one's cable has been substituted, if you havve a test
meter checking resistances between pins 2 and the others then
comparing with the "good" one may give a clue.

Also is it arranged in the same way with respect to filtering.

Phil
--
spamcop.net address commissioned 18/06/04
Come on down !

Phil,
Have made some slight progress I think. Had an ex-BT mate come around and
look at the sockets. He checked that all three extension sockets were wired
OK. He then identified a 'hum' on the line as a possible earthing problem
so he switched a couple of pairs between the BT outside wall box and the BT
internal master socket and that reduced the hum a little. He then suggested
that I report the line to BT as faulty. This I have done and they have done
a line test and agreed that there is a fault on the line. It has been
reported to the techies and they expect it to be sorted by Wed. As I write
the fault still exists but maybe, just maybe, we are a step nearer solving
the problem. I will keep you posted.

I am copying this direct to your e-mail as you may not pick it up from the
newsgroup. - always assuming that 'spamcop' lets it through!

Regards,

Dave